Pump structure for dispenser

ABSTRACT

A pump structure for dispenser includes a base having a space defined therein and passing therethrough. The base has a vertical groove axially defined in an outer periphery thereof and a plurality of horizontal grooves parallelly defined in the outer periphery thereof and communicated with the horizontal grooves. A base ring is sleeved on the base. The base ring has a protrusion extending from an inner periphery thereof for slidably moving in the vertical groove and the horizontal groove. A saddle head is movably sleeved on the base. An upper valve set is mounted in a pathway in the saddle head and a lower valve set is mounted in the space in the base.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to pump structure for a dispenser, and more particularly to a dispenser pump structure for adjusting rationing liquid.

2. Description of Related Art

A conventional dispenser provides a double pistons structure for dispensing emulsion. The conventional dispenser includes a pump and an inductor received in the pump. The inductor has a top connected with a saddle head. The pump has an actuating groove defined therein for receiving the inductor. An elastomer is located in the actuating groove and connected with a bottom of the inductor. A valve is positioned in a bottom of the actuating groove. A piston set is assembled with the inductor. The piston set includes a first piston and a second piston connected with the first piston. The first piston includes a first tube for assembling with the inductor and a first flange for abutting against an inner periphery of the actuating groove. The second piston includes a second tube for assembling with the first piston and a second flange for abutting against the inner periphery of the actuating groove. The conventional dispenser is strengthened due to the double pistons structure for providing a long-wearing effect.

However, the conventional dispenser is not able to provide quantitatively rationing. The rationing of the conventional dispenser is decided by a pressure on the saddle head. This is inconvenient and is not able to provide a precise ration. When the pressure is over the expected value, the overflow dose will cause waste.

The present invention has arisen to obviate/mitigate the disadvantages of the conventional dispenser.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide an improved pump structure for dispenser.

To achieve the objective, a pump structure for dispenser in accordance with the present invention comprises a base adapted to assemble with a bottle. The base has a space defined therein and passing therethrough. The base has a vertical groove axially defined in an outer periphery thereof and a plurality of horizontal grooves parallelly defined in the outer periphery thereof. The vertical groove is communicated with the horizontal grooves. At least one horizontal groove extends toward a direction opposite to the other horizontal grooves. A base ring is sleeved on the base. The base ring has a protrusion extending from an inner periphery thereof The protrusion is slidably movable in the vertical groove and the horizontal grooves. The base ring has an indicator disposed thereon and corresponding to a location of the protrusion. The base ring is able to be bidirectionally rotated. A saddle head is movably sleeved on the base. The saddle head has a pathway defined therein and passing therethrough. The saddle head has a piston movably received in the space. The piston has an outer periphery abutting against an inner periphery of the space. A spring is sleeved on the base. The spring has two ends respectively abutting against the saddle head and the base ring for providing a restitution force. An upper valve set is mounted in the pathway and a lower valve set is mounted in the space in the base. The upper valve set has a same structure with the lower valve set. Each of the upper valve set and the lower valve set has an outer ring and an inner ring received in the outer ring. Each outer ring has a plunger disposed therein and a plurality of ribs connected with the plunger and an inner periphery of the outer ring. Each inner ring has a guiding path defined therein. The plunger of the outer ring is able to selectively seal the guiding path of the corresponding inner ring. The saddle head has a seat mounted in interior thereof for receiving the upper valve set. The piston is sleeved on a bottom end of the seat. The saddle head has a skirt downwardly formed thereon. The base is located between the skirt and the seat. The base has a dove-tail flange annularly and outwardly extending therefrom. The skirt has a dove-tail flange annularly and inwardly extending therefrom for corresponding to the dove-tail flange of the base such that the dove-tail flange of the base and the dove-tail flange of the skirt are buckled to each other for preventing the saddle head detaching from the base.

When the saddle head is pressed, the piston presses the air in the space to push the plunger of the outer ring of the upper valve set such that the air is exhausted from the pathway in the saddle head. The plunger of the outer ring of the lower valve set is pressed by the air to seal the guiding path of the inner ring.

When the saddle head is released and returned due to the restitution force of the spring, the piston of the upper valve set is upwardly moved such that the air pressure in the space is decreased to suck the outer ring of the lower valve set upwardly moved relative to the inner ring and to suck the liquid in the bottle flowing into the space via the guiding path in the inner ring of the lower valve set. In the meanwhile, the outer ring of the upper valve set is downwardly sucked by the air pressure in the space such that the plunger is sealed the guiding path of the upper valve set.

When the saddle head is pressed again, the liquid in the space is able to be drained from the pathway for providing rationing liquid.

When the base ring is longitudinally moved relative to the base, the protrusion is moved along the vertical groove for adjusting a distance between the saddle head and the base ring such that an amount of the liquid drained from the space is adjusted.

When the base ring is rotated relative to the base, the protrusion is moved along one of the plurality of the horizontal grooves for fixing the distance between the saddle head and the base ring.

In accordance with another aspect of the present invention, the saddle head has a flange annularly and outwardly extending therefrom. The two ends of the spring are respectively abutted against the base ring and the flange.

Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of a pump structure for dispenser in accordance with the present invention;

FIG. 2 is an assembled perspective view of the pump structure for dispenser in accordance with the present invention;

FIGS. 3-5 are operational cross-sectional views of the pump structure for dispenser in accordance with the present invention; and

FIG. 6 is an assembled perspective view of a second embodiment of the pump structure for dispenser in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings and initially to FIGS. 1-2, the pump structure for dispenser in accordance with the present invention comprises a base 1 adapted to assemble with a bottle (not shown), a base ring 5 sleeve on a lower end of the base 1, a saddle head 2 movably sleeved on a upper end of the base 1, an upper valve set 3 mounted in the saddle head 2, and a lower valve set 4 mounted in the base 1.

The base 1 has a tubular structure. The base 1 has a space 11 defined therein and passing therethrough. The base 1 has the lower end adapted to connect with the bottle and the lower valve set 4 is mounted in the lower end of the base 1 for communicating the bottle and the space 11. The base 1 has a vertical groove 52 axially defined in an outer periphery thereof and a plurality of horizontal grooves 53 parallelly defined in the outer periphery thereof. The vertical groove 52 is communicated with the horizontal grooves 53. At least one horizontal groove 53 extends toward a direction opposite to the other horizontal grooves 53 and has one end communicating with the vertical groove 52. In the preferred embodiment of the present invention, the base 1 has three horizontal grooves 53 parallelly defined in the outer periphery thereof. A middle horizontal groove 53 of the three horizontal grooves 53 extends opposite to the other horizontal grooves 53.

The base ring 5 has a flat plate structure. The base ring 5 is able to move and rotate relative to the base 1. The base ring 5 has a protrusion 51 extending from an inner periphery thereof The protrusion 51 is slidably movable in the vertical groove 52 and the horizontal grooves 53. The base ring 5 has an indicator 54 disposed thereon and corresponding to a location of the protrusion 51.

The saddle head 2 has a pathway 25 defined therein and passing therethrough. The saddle head 2 has a piston 21 movably received in the space 11. The piston 21 has an outer periphery abutting against an inner periphery of the space 11. As shown in FIGS. 1 and 3, the saddle head 2 has a seat 22 mounted in interior thereof for receiving the upper valve set 3. The piston 21 is sleeved on a bottom end of the seat 22. The saddle head 2 has a skirt 23 downwardly formed thereon. The base 1 is located between the skirt 23 and the seat 22. The base 1 has a dove-tail flange 12 annularly and outwardly extending therefrom. The skirt 23 has a dove-tail flange 24 annularly and inwardly extending therefrom for corresponding to the dove-tail flange 12 of the base 1 such that the dove-tail flange 12 of the base 1 and the dove-tail flange 24 of the skirt 23 are buckled to each other for preventing the saddle head 2 detaching from the base 1. The saddle head 2 is slidably moved relative to the base 1. The piston 21 is able to compress and exhaust the air in the space 11. A spring 13 is sleeved on the base 1. The spring 13 has two ends respectively abutting against an inner periphery of the skirt 23 of the saddle head 2 and the base ring 5 for providing a restitution force.

As shown in FIGS. 1 and 3, the upper valve set 3 is mounted in the pathway 25 and the lower valve set 4 is mounted in the space 11 in the base 1. The upper valve set 3 has a same structure with the lower valve set 4. The upper valve set 3 has an outer ring 31 and an inner ring 32 received in the outer ring 31. The outer ring 31 of the upper valve set 3 has a plunger 311 disposed therein and a plurality of ribs 312 connected with the plunger 311 and an inner periphery of the outer ring 31. The inner ring 32 of the upper valve set 3 has a guiding path 321 defined therein. The plunger 311 of the outer ring 31 of the upper valve set 3 is able to selectively seal the guiding path 321 of the inner ring 32 of the upper valve set 3. The lower valve set 4 has an outer ring 41 and an inner ring 42 received in the outer ring 41 The outer ring 41 of the lower valve set 4 has a plunger 411 disposed therein and a plurality of ribs 412 connected with the plunger 411 and an inner periphery of the outer ring 41. The inner ring 42 of the lower valve set 4 has a guiding path 421 defined therein. The plunger 411 of the outer ring 41 of the lower valve set 4 is able to selectively seal the guiding path 421 of the inner ring 42 of the lower valve set 4. Precisely, each outer ring 31, 41 has three ribs 312, 412 equidistantly connected with the plunger 311, 411 and the inner periphery of the outer ring 31, 41. The ribs 312, 412 are provided for a restitution force to selectively seal the guiding path 321, 421 and positioning the plunger 311, 411 to partially insert into the guiding path 321, 421.

In the preferred embodiment of the present invention, each plunger 311, 411 has a hemispherical shaped structure for tightly plunging into the guiding path 321, 421. Each guiding path has a downwardly tapered structure. The part of each guiding path 321, 421 contacted with the corresponding plunger 311, 411 has a rounded structure for preventing the plunger 311, 411 from damaging.

With reference to FIGS. 3-4, when the saddle head 2 is pressed, the piston 21 presses the air in the space 11 to push the plunger 311 of the outer ring 31 of the upper valve set 3 such that the air exhausted from the pathway 25 in the saddle head 2. The plunger 411 of the outer ring 41 of the lower valve set 4 is pressed by the air to seal the guiding path 421 of the inner ring 42 of the lower valve set 4. When the saddle head 2 is released and returned due to the restitution force of the spring 13, the piston 21 of the upper valve set 3 is upwardly moved such that the air pressure in the space 11 is decreased to suck the outer ring 41 of the lower valve set 4 upwardly moved relative to the inner ring 42 and to suck the liquid in the bottle flowing into the space 11 via the guiding path 421 in the inner ring 42 of the lower valve set 4. In the meanwhile, the outer ring 31 of the upper valve set 3 is downwardly sucked by the air pressure in the space 11 such that the plunger 311 is sealed the guiding path 321 of the upper valve set 3. When the saddle head 2 is pressed again, the liquid in the space 11 is able to be drained from the pathway 25. When the saddle head 2 is released again, the liquid in the bottle is sucked into the space 11 again for providing rationing liquid.

As above described, the saddle head 2 is pressed in a first time, the air in the space 11 is exhausted outside. When the saddle head 2 is restored, the liquid in the bottle is drained into the space 11. Later, the space 11 is refilled with the liquid when the saddle head 2 is pressed in every time. The dose of the liquid drained from the saddle head 2 is the same with that refilled in the space 11. Therefore, the dose of the liquid is stable in every time for providing the rationing liquid.

With reference to FIGS. 3-5, when the base ring 5 is longitudinally moved relative to the base 1, the protrusion 51 of the base ring 5 is moved along the vertical groove 52 for adjusting a distance between the saddle head 2 and the base ring 5. When the base ring 5 is rotated relative to the base 1, the protrusion 51 is moved along one of the plurality of the horizontal grooves 53 for fixing the distance between the saddle head 2 and the base ring 5. The saddle head 2 is pressed and released to process a stroke. The stroke of the saddle head 2 is adjustable due to the distance between the saddle head 2 and the base ring 5. When the base ring 5 is downwardly moved, the base ring 5 is away from the saddle head 2 such that the stroke of the saddle head 2 is increased and the piston 21 is able to deeply move in the space 11. The liquid drained from the space 11 is increased during every stroke of the saddle head 2. When the base ring 5 is upwardly moved, the base ring 5 is close to the saddle head 2 such that the stroke of the saddle head 2 is decreased and the piston 21 is able to shallowly move in the space 11. The liquid drained from the space 11 is decreased during every stroke of the saddle head 2. Therefore, a user can easily adjust an amount of the liquid drained from the space 11 to prevent from wasting. In the preferred embodiment, the middle horizontal groove 53 and the other two horizontal grooves 53 respectively extends from two opposite sides of the vertical groove 52 such that the base ring 5 is able to be bidirectionally rotated. The user can easily confirm the distance between the saddle head 2 and the base ring 5 by rotating the base ring 5 along different extending directions of the horizontal grooves 53.

With reference to FIG. 6, that shows a second embodiment of the pump structure for dispenser in accordance with the present invention. The elements and effects of the second embodiment which are the same with the first embodiment are not described, only the differences are described. The saddle head 2 has a flange 26 annularly and outwardly extending therefrom to form a flat plate. The two ends of the spring 13 are respectively abutted against the base ring 5 and the flange 26.

Although the invention has been explained in relations to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed. 

1. A pump structure for dispenser comprising: a base adapted to assemble with a bottle, the base having a space defined therein and passing therethrough, the base having a vertical groove axially defined in an outer periphery thereof and a plurality of horizontal grooves parallelly defined in the outer periphery thereof, the vertical groove communicated with the horizontal grooves; a base ring sleeved on the base, the base ring having a protrusion extending from an inner periphery thereof, the protrusion being slidably movable in the vertical groove and the horizontal grooves; a saddle head movably sleeved on the base, the saddle head having a pathway defined therein and passing therethrough, the saddle head having a piston movably received in the space, the piston having an outer periphery abutting against an inner periphery of the space, a spring sleeved on the base, the spring having two ends respectively abutting against the saddle head and the base ring for providing a restitution force; and an upper valve set mounted in the pathway and a lower valve set mounted in the space in the base, the upper valve set having a same structure with the lower valve set, each of the upper valve set and the lower valve set having an outer ring and an inner ring received in the outer ring, each outer ring having a plunger disposed therein and a plurality of ribs connected with the plunger and an inner periphery of the outer ring, each inner ring having a guiding path defined therein, the plunger of the outer ring being able to selectively seal the guiding path of the corresponding inner ring; wherein when the saddle head is pressed, the piston presses the air in the space to push the plunger of the outer ring of the upper valve set such that the air is exhausted from the pathway in the saddle head, the plunger of the outer ring of the lower valve set pressed by the air to seal the guiding path of the inner ring; when the saddle head is released and returned due to the restitution force of the spring, the piston of the upper valve set upwardly is moved such that the air pressure in the space is decreased to suck the outer ring of the lower valve set upwardly moved relative to the inner ring and to suck the liquid in the bottle flowing into the space via the guiding path in the inner ring of the lower valve set, in the meanwhile, the outer ring of the upper valve set downwardly sucked by the air pressure in the space such that the plunger is sealed the guiding path of the upper valve set; when the saddle head is pressed again, the liquid in the space is able to be drained from the pathway for providing rationing liquid; wherein when the base ring is axially moved relative to the base, the protrusion is moved along the vertical groove for adjusting a distance between the saddle head and the base ring such that an amount of the liquid drained from the space is adjusted; when the base ring is rotated relative to the base, the protrusion is moved along one of the plurality of the horizontal grooves for fixing the distance between the saddle head and the base ring.
 2. The pump structure for dispenser as claimed in claim 1, wherein the saddle head has a seat mounted in interior thereof for receiving the upper valve set, the piston sleeved on a bottom end of the seat, the saddle head having a skirt downwardly formed thereon, the base located between the skirt and the seat.
 3. The pump structure for dispenser as claimed in claim 1, wherein the base ring has an indicator disposed thereon and corresponding to a location of the protrusion.
 4. The pump structure for dispenser as claimed in claim 1, wherein at least one of the horizontal grooves extending toward a direction opposite to the other horizontal grooves such that the base ring is able to be bidirectionally rotated.
 5. The pump structure for dispenser as claimed in claim 1, wherein the saddle head has a flange annularly and outwardly extending therefrom, the two ends of the spring respectively abutted against the base ring and the flange.
 6. The pump structure for dispenser as claimed in claim 2, wherein the base has a dove-tail flange annularly and outwardly extending therefrom, the skirt having a dove-tail flange annularly and inwardly extending therefrom for corresponding to the dove-tail flange of the base such that the dove-tail flange of the base and the dove-tail flange of the skirt are buckled to each other for preventing the saddle head detaching from the base. 